Apparatus for finishing gears



March 4, 1930. w, E, HOKE 1,749,704

APPARATUS FOR FINISHING GEARS asi, Ww :IWA rma/fw@ Mallch 4, 1930. 5 HQKEy A 1,749,704'

APPARATUS FOR INISHING GEARS Filed Jan. 11, .1924 sheets-sneer 2 l lllllllllll llllll lllllllllllllll l lll lllll l Patented Mar. 4, 1930 WILLIAM E. HOKE, F BALTIMORE, MARYLAND APPARATUS FOB IEINJIIZSEINGV GEABS Application filed '.anuary 11, 1924. Serial No. 685,684.

This invention relates to apparatus for accurately finishing gears and more in particular transmission gears of motor vehicles.

Transmissions of the type referred to inl clude as one member a gear mounted on a stub-shaft.

It is the principal object of this invention to expeditiously finish gears of this character and it is a more special object to finish a larger number of such gears at the same time or in one operation.

For a more comprehensive disclosure of the invention and the principle of operation upon which it is based, reference is made to I5 the accompanying drawings in which-- Fig. 1 is a vertlcal section throughan' apparatus embodying the invention;

tion .d

Fig. 3 is a perspective view of one of the carriages in which the stub-shafts are supported; Y

Fig. 4 is a vertical section of a modified form thereof;

Fig. 5 is a fragmentary vertical-section of mechanism showing modifications of the ap-l paratus shown in Figs. 1 and 2; r" 1g. 6 is a plan view thereof, parts being removed; and

Fig. 7 is a vertical section through -one of the shaft-supporting pivot screws.

Thev'invention, briefly expressed, comprises a central lapping gear means for supporting a number of gears to be linished around the central lapping gear in mesh engagement therewith, means for operating the lapping gear and mechanism whereby the gears may be lapped under load conditions.

, In Fig. 1 the lapping gear 10 is shown as mounted in a bearing 11 upon a frame struc ture 12. Suitable means may be provided for vertically reciprocating and revolving the lapping ear. Such means have been omitted, for t e sake of simplicity, in Fig. 1, but may consist of any one-of many arrangements well known in the art, one of. which will be specifically referred to in connection with Figs. 5 and 6.

A plurality of gears 13 together with their stub-shafts 1'3l are mounted upon station- Fig. 2 is a plan `view thereof, partly in seccarrying at its lower endra roller 22.

ary pivots 14 carried by the ring portion 15 A -of frame 12. The upper ends of the stubshafts 13a are pivotally held by pivot screws 16 which are movably supported as willbe v more particularly pointed out.

The frame 12 is upwardly extended to provide an upper platform or table 17.v The table 17 has radial recesses 18 in vertical alignment with the gears 13 and their stubshafts 13"-. These recesses define sli'deways for carriages 19 supporting the pivot screws 16. The carriages 19 have lateral grooves 19'* co-operating with corresponding tongues 18a on the lateral walls of the recesses 18 for movably supporting and guiding the carriages in the recesses.

` Centrally upon the table 17 is provided a bearing 20 in which is mounted a shaft I211 T e oller 22 has a diameter corresponding to the lpitch line diameter of the lapping gear 10 nd the shaft 21 isin vertical alignment with the shaft 10EL of theslapping gear.. The shaft 21 andthe roller 2 2 may be supported inv any suitable way. As indicated, the shaft 21 carries at its upper end a wheel or pulley 23 which is'secured to the shaft 21 and is supported upon the bearing 20 by an antifriction disk 24.

Upon thev upper end of the stub-shafts 13a are mounted rollers 25 whose diameter corresponds exactl to the pitch line diameter of the gears 13. he rollers 25 thus normally contact with the roller 22.

The carriages 19 are acted upon by springs 26 centered upon journals 27 and 28 on the carriages 19 and' screws 29 respectively.y The latter are supported upon yokes 30, which are secured to the table 17 at opposite sides of the recesses 18, and maybe screwed forwardly or backwardlky to adjust the pressure of the springs upon he carriages.

The rollers 25 are thus forced into frictional contact with the roller 22v and since the latter and the rollers 25 correspond exactly to the lapping gear 10 and the gears 13, they lhave the same relative movement.

vThe wheel 23 is engaged by a brake shoe -31 composed of twolhalves joined atene end' byI a hinge connection 32 and forced toward in operative position by la nut 35. Interme-v leach other at the opposite end by means of a spring 33 carried upon a bolt 34 and held diate the free ends of the brake shoe is disposed a cam member 36 by which the free ends of the brake may be forced apart against the tension of t-he spring 33 to make the latter ineective. By the operation of the cam element 36 the brake may thus be made operative or inoperative at will and by regulating Y the degree of compression of the spring 33,

- the ldegree of the braking action may be varied as desired. In' consequence the gears 13 may be subjected at will to load conditions of any desired degree.

If desired, instead of pivot screws 16 may v,be used pivot pins 37 `normally held in engagement with the stub-shafts by springs.

' -As indicated in Fig'. 4, a pin 37 may have a collar 38 for taking the thrust of' spring 39, the outer end of which may bear against an abutment 40 secured to or forming part of the carriage 41. A grip portion 42 at the outer end of the pin may serve the-purpose to facilitatefretraction of the pin. Byvthe arrangement described a' gear 13 may be quickly placed in positionlor taken out of it.:

The form of construction illustrated in Figs. '5 and 6 does not essentially differ from theform shown in Figs. 1 and 2 so far as the principle of operation is concerned... It

is to indicate merely that, there is considerincluding gear 54, pinion 55 and bevel gears v 56 and 57. The gear '54 may be'splined to the shaft and held in-position betweenstationary sleeves 58 and 59 forming also bearings for the shaft 51. The Vshaft 51 is revolubly connected vto the connecting rod through ball-bearin swivel joint 60.

Figs. 5- also show amodified form of mechanism for urging 'the rollers 61'into'frictional contact with the `central roller 62..

Upon the table 63 are pivotally mounted by means of studs 64 arms 65 which carry screws are free to move'.

at their free ends pivot screws 66. The table` has e''ngated slots 67 in. which the pivot The'arms 65 are acted upon. by leaf springs-68 which are anchored at one end in qthe arms 65 and bear at the free ends against pins 69. The pivot -l screws 66 thus force the rollers 61 against` roller 62 which is mounted upon a downward l extension of sleeve 59.

A brake band'71 similar to that-previollsly. described may operatel upon the collar of the roller 62 to providea/load.-

wha@ in Figs. 5 and c a moaifiedcoistmc-f tion foi-supporting, reciprocating and revolving the lapping gear is shown together lwith a modified mechanism for urging the rollers intov frictional Contact, it' is obvious that this is done as a matter of expedlence only, for purposes of illustration. The two features are entirely separate and independent ofeach other yso far as their function and operative slgnificance 1s concerned.

As indicated in Figs. 5 and 6, the recipro-l cating movement and,` the ,rotary movement of shaft- 51 may be' effected by separated means and independently of each` other, ln practice, the lapping gear is longitudinally moved to one end of its stroke and then rotated for removing burs and for rough nishing. Thereafter the operation takes place by simultaneouslyvv reciprocating and rotating the lapping gear to effect the flnishing pro.

per. As indicated in Fig.` 1, the -smaller section 10l ofthe lapping gear may be used for the rough work whilev the remaining larger portion may be used kfor the finer finishing work.

While in the lforegoingI have. -describe whatI at present consider referred or ad-A vantageous embodiments o 'the-invention,

'the principle of operation characterizing the inventlon may be carried out. 1n various other ways and by entirely different apparatus. I claim, I

. 1. In apparatus for finishing gears, lthe combination lof a central gear of considerable axialv extent, means for revolubly supporting a. pluralityl of gears to be finished in mesh relation therewith and means for reciprocatl ing and for rotating the central gear.

2. In apparatus for finishingv gears, the I combination of a central gear of considerable axial extent, means for-revolubly supporting a plurallty of gears to be finished in mesh relation therewith, means for reciprocating the central gear and means for rotating the same, the means for reciprocating Athecentral gear and the means for rotatin it being oper'- able independently of-each ot er.

3. In apparatus lfor finishing gears, the

combination of a central gear of considerable axial extent, means for revolubly supporting a plurality of gears to be finished in mesh relation therewith, means for reciprocating and rotating the central gear and means including transmission mechanism interconnecting all gears to be finished for putting the samel under load conditions.

4. In apparatus for finishing gears carriedl on stub-shafts, the combination of a central gear of considerable axial extent, means for revolubly supporting the stub-shafts to bring theJ gears in mesh relation with said central gear, and means for reciprocating and for rotating the central gear.

5. In apparatus for finishing gears carried on stub-shafts, the combination of a central gear of considerable axial extent, means for revolubly sujporting the stub-shafts to'bring the gears to e inished in mesh relation with said central gear, means for reci rocating the central gear and means for rotating the same, the means for reciprocating the central gear and the means for rotating it being operable independently of eachother.

6. In a paratus for finishing gears carried on stubafts, the combination of a central gear of considerable axial'extent, means for vrevolubly su portingithe stub-shafts to bring the gears to e iinished in mesh relation with said central gear, means for reciprocating and for rotating the central gear and means including transmission mechanism interconnectin all stub-shafts for putting the gears to be shed under load conditions.

7. Apparatus according to claim 6 including a central roller of a diameter correspondtral roller.

ing to the pitch line diameter of the central gear and in axial ali nment therewith, a roller onl each stub-sha of a diameter corresponding to the pitch line diameter of the gears to beinished, means for pressing the rollers into rictional contact with the central roller and means for braking the cenradially toward the axis of t e central i 

